(19)
(11) EP 0 182 550 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.01.1987 Bulletin 1987/02

(43) Date of publication A2:
28.05.1986 Bulletin 1986/22

(21) Application number: 85308115

(22) Date of filing: 07.11.1985
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 13.11.1984 GB 8428640

(71) Applicant: AVON INDUSTRIAL POLYMERS LIMITED
 ()

(72) Inventor:
  • Angell, Cyril Nelson Edward
     ()

   


(54) Valve for respirator


(57) A valve for a respirator has an elastomeric valve member (18) of generally dished form with an annular channel (25) around its central portion (24). The member (18) is secured at its centre by means of a shouldered conical stem (19) and seals round its periphery (23). The channel (25) allows a sudden collapse of resistance to opening force in the direction of the arrow A above a predetermined amount, but a positive biassing action towards closure. The edges of the channel (26, 27) are slightly axially displaced from one another. Both inlet and outlet valves of a respirator may be equipped with such a valve member.






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